ASTM D5624-00

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Designation: D 5624 – 00
Standard Test Method for
Determining the Transverse-Aggregate Spread Rate for
Surface Treatment Applications
This standard is issued under the fixed designation D 5624; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Apparatus
1.1 This test method details the procedure for calibrating the 5.1 Balance—A balance of sufficient capacity to handle the
transverse-aggregate spread rates in 0.3–m (1–ft) increments. weight of the aggregate shall be provided. This balance shall be
1.2 This standard does not purport to address all of the readable and accurate to1gif only the transverse spread rate
safety concerns, if any, associated with its use. It is the is being determined; an accuracy of 0.1 g is needed if moisture
responsibility of the user of this standard to establish appro- content is being determined. All scales shall meet the require-
priate safety and health practices and determine the applica- ment set forth in Method E 898 for top loading, direct-reading
bility of regulatory limitations prior to use. laboratory scales and balances.
5.2 Containers—Any container of a sufficient size to hold
2. Referenced Documents
the contents of one rubber mat. If moisture content is to be
2.1 ASTM Standards:
determined, then the container should be sealable.
C 566 Test Method for Total Moisture Content of Aggregate 5.3 Rubber Mats— Rubber mats should have grooves of
by Drying
sufficient depth to prevent aggregate from rolling and slipping
C 136 Test Method for Sieve Analysis of Fine and Coarse when the chips are spread. The mats should be cut in widths
Aggregates
appropriate for the gate openings of the equipment being
E 898 Method of Testing Top Loading, Direct-Reading adjusted. Widths of 0.3 m (1 ft) have been commonly used. The
Laboratory Scales and Balances
length of the mats should be a minimum of 0.9 m (3 ft). Mats
should be cut so that the grooves are perpendicular to the 0.9
3. Summary of Test Method
m (3 ft) side.
3.1 The transverse-aggregate spread rate is determined by
NOTE 1—Rubber floor mats conforming to these specifications are
the use of a series of rubber pads laid side by side width-wise
available at local hardware stores. Various sizes can be accommodated and
across the pavement. The chip spreader is then allowed to
both English and SI units can be handled.
proceed across the rubber mats with the gates open allowing
5.4 Oven—The oven shall be a forced air type oven capable
the aggregate to drop onto the mats. Aggregate collected on
of maintaining a uniform temperature of 110 6 5°C (230 6
each of the mats is removed and weighed. The transverse-
9°F) .
aggregate distribution can then be calculated, and the chip
spreader adjusted if desired. Moisture content and aggregate
PROCEDURES
gradation can be determined from the collected material.
6. Determination of Transverse Spread Rate
4. Significance and Use
6.1 Place the rubber mats side by side width-wise on the
4.1 This test method can be used to calibrate aggregate
pavement with the grooves perpendicular to the centerline (Fig.
spreaders prior to construction.
1). The number of rubber mats to be used shall be equal to the
4.2 Quality control during construction can be monitored.
width of aggregate distribution to be monitored.
4.3 Moisture content and sieve analysis of the aggregates at
6.2 Tare one container for each mat to be used. If the
the time of construction can also be obtained.
container has a lid, tare the container with the lid. Designate
this mass as B.
6.3 Drive the aggregate spreader over the pads with the
gates open to allow the aggregate to fall onto the rubber mats.
This test method is under the jurisdiction of ASTM Committee D04 on Road
and Paving Materials and is the direct responsibility of Subcommittee D04.24 on
The gates must be opened a minimum of 2.5 m (8 ft) before
Bituminous Surface Treatments.
reaching the rubber mats. This allows time for the transverse-
Current edition approved July 10, 2000. Published September 2000. Originally
aggregate distribution to stabilize.
published as D 5624–94. Last previous edition D 5624–94.
6.4 The aggregate spreader should be operated just as if it
Annual Book of ASTM Standards, Vol 04.02.
Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
D 5624
FIG. 1 Layout of Mats
were being used during construction. Speed and gear settings
S = aggre
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